Height gauge



FIG. 1 is a front, right-side, top perspective view of a height gauge, showing the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged view of the area bound by arrows 8 in FIG. 2 .

The broken lines depict parts of the height gauge that form no part of the claimed design. 

CLAIM The ornamental design for a height gauge, as shown and described. 